1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef _ASM_X86_DWARF2_H
3#define _ASM_X86_DWARF2_H
4
5#ifndef __ASSEMBLY__
6#warning "asm/dwarf2.h should be only included in pure assembly files"
7#endif
8
9/*
10 * Macros for dwarf2 CFI unwind table entries.
11 * See "as.info" for details on these pseudo ops. Unfortunately
12 * they are only supported in very new binutils, so define them
13 * away for older version.
14 */
15
16#ifdef CONFIG_AS_CFI
17
18#define CFI_STARTPROC .cfi_startproc
19#define CFI_ENDPROC .cfi_endproc
20#define CFI_DEF_CFA .cfi_def_cfa
21#define CFI_DEF_CFA_REGISTER .cfi_def_cfa_register
22#define CFI_DEF_CFA_OFFSET .cfi_def_cfa_offset
23#define CFI_ADJUST_CFA_OFFSET .cfi_adjust_cfa_offset
24#define CFI_OFFSET .cfi_offset
25#define CFI_REL_OFFSET .cfi_rel_offset
26#define CFI_REGISTER .cfi_register
27#define CFI_RESTORE .cfi_restore
28#define CFI_REMEMBER_STATE .cfi_remember_state
29#define CFI_RESTORE_STATE .cfi_restore_state
30#define CFI_UNDEFINED .cfi_undefined
31#define CFI_ESCAPE .cfi_escape
32
33#ifdef CONFIG_AS_CFI_SIGNAL_FRAME
34#define CFI_SIGNAL_FRAME .cfi_signal_frame
35#else
36#define CFI_SIGNAL_FRAME
37#endif
38
39#if defined(CONFIG_AS_CFI_SECTIONS) && defined(__ASSEMBLY__)
40#ifndef BUILD_VDSO
41 /*
42 * Emit CFI data in .debug_frame sections, not .eh_frame sections.
43 * The latter we currently just discard since we don't do DWARF
44 * unwinding at runtime. So only the offline DWARF information is
45 * useful to anyone. Note we should not use this directive if
46 * vmlinux.lds.S gets changed so it doesn't discard .eh_frame.
47 */
48 .cfi_sections .debug_frame
49#else
50 /*
51 * For the vDSO, emit both runtime unwind information and debug
52 * symbols for the .dbg file.
53 */
54 .cfi_sections .eh_frame, .debug_frame
55#endif
56#endif
57
58#else
59
60/*
61 * Due to the structure of pre-exisiting code, don't use assembler line
62 * comment character # to ignore the arguments. Instead, use a dummy macro.
63 */
64.macro cfi_ignore a=0, b=0, c=0, d=0
65.endm
66
67#define CFI_STARTPROC cfi_ignore
68#define CFI_ENDPROC cfi_ignore
69#define CFI_DEF_CFA cfi_ignore
70#define CFI_DEF_CFA_REGISTER cfi_ignore
71#define CFI_DEF_CFA_OFFSET cfi_ignore
72#define CFI_ADJUST_CFA_OFFSET cfi_ignore
73#define CFI_OFFSET cfi_ignore
74#define CFI_REL_OFFSET cfi_ignore
75#define CFI_REGISTER cfi_ignore
76#define CFI_RESTORE cfi_ignore
77#define CFI_REMEMBER_STATE cfi_ignore
78#define CFI_RESTORE_STATE cfi_ignore
79#define CFI_UNDEFINED cfi_ignore
80#define CFI_ESCAPE cfi_ignore
81#define CFI_SIGNAL_FRAME cfi_ignore
82
83#endif
84
85#endif /* _ASM_X86_DWARF2_H */
86